linux-kernel - [PATCH 16/50] memory hotplug: Define memory_block_size_bytes for x86_64 with CONFIG_X86

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Date:	Wed, 16 Mar 2011 14:10:54 -0700
From:	Greg Kroah-Hartman <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org
Cc:	Nathan Fontenot <nfont@...tin.ibm.com>, Robin Holt <holt@....com>,
	Jack Steiner <steiner@....com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 16/50] memory hotplug: Define memory_block_size_bytes for x86_64 with CONFIG_X86_UV

From: Nathan Fontenot <nfont@...tin.ibm.com>

Define a version of memory_block_size_bytes for x86_64 when CONFIG_X86_UV is
set.

Signed-off-by: Robin Holt <holt@....com>
Signed-off-by: Jack Steiner <steiner@....com>
Signed-off-by: Nathan Fontenot <nfont@...tin.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 arch/x86/mm/init_64.c |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 71a5929..17e90d1 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -51,6 +51,7 @@
 #include <asm/numa.h>
 #include <asm/cacheflush.h>
 #include <asm/init.h>
+#include <asm/uv/uv.h>
 
 static int __init parse_direct_gbpages_off(char *arg)
 {
@@ -908,6 +909,19 @@ const char *arch_vma_name(struct vm_area_struct *vma)
 	return NULL;
 }
 
+#ifdef CONFIG_X86_UV
+#define MIN_MEMORY_BLOCK_SIZE   (1 << SECTION_SIZE_BITS)
+
+unsigned long memory_block_size_bytes(void)
+{
+	if (is_uv_system()) {
+		printk(KERN_INFO "UV: memory block size 2GB\n");
+		return 2UL * 1024 * 1024 * 1024;
+	}
+	return MIN_MEMORY_BLOCK_SIZE;
+}
+#endif
+
 #ifdef CONFIG_SPARSEMEM_VMEMMAP
 /*
  * Initialise the sparsemem vmemmap using huge-pages at the PMD level.
-- 
1.7.4.1

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